Dannyalcatraz said:
Not quite- I'm talking about something a bit more sophisticated.
The code I'm envisioning lets you copy the PDF. Just how many times is determined by the PDF's creator- one only, one a month, whatever up to an unlimited number or. Once that number is reached, the PDFf can no longer be copied...unless you purchase a renewal code.
The code might also include a virus that destroys unauthorized electronic copies of itself- kind of like the exploding dye packets you used to see in clothing retailers. As a security feature for the purchaser, each PDF would have a purchase code delivered as a seperate file- if your PDF was incorrectly destroyed, you call the PDF issuer, tell them what happened and give them your code to recieve a new PDF (and security code).
Or some such- I'm no programmer, but I know several. Such things are possible.
Of course, such measures would only be a skirmish in the battle of IP protection vs IP infringement...other measures would eventually replace the above.
Danny, when you are reading a forum and you see someone say, "I'm not a lawyer, but...." and then make a most outlandish statement, do you shake your head in amusement or sadness? You know several simple ways to explain why they are wrong but those simple explanations assume the other listener is an attorney. For a layman the explanation actually isn't simple and you just can't take the time to explain it.
Well, I'm a programmer and I'm shaking my head in amusement and contrary to my prior paragraph, I'm gonna go for it. Tell me, if I take this magic PDF you describe and burn it onto a CD before I ever open it, will it be able to delete itself if I abuse it? Nope. What stops me from burning 100 copies of the CD? 1000? Nothing. Suppose I do a complete format and reinstall of Windows (on a machine not connected to a network) every time before inserting the CD into the machine and access the PDF, copying the contents out once, will the copy on the CD know I've copied the data more than once? More than zero times? Nope. There is no place for the PDF to store this data, as it is written on readonly media.
Now, before you say that's a lot of trouble to go through just to copy a PDF, let me introduce you to virtual machine programs. Programs running on you computer can emulate entire systems with different operating system running on them. Multiple copies of an OS or machine setup can be created/destroyed in minutes. So, I could install the PDF into a virtual installation of Windows, set the session to no network access and make the hard drive read only. Now whenever I need that PDF, I can access it fully getting around the DRM whenever I want and it just takes a minute or two to setup.
Even in a normal setup, if the PDF let's me copy the entire contents to the clipboard, what stops me from posting it to another file and sending out onto the Internet for all the world to see? Heck, if I have a big enough screen/monitor setup, I can view the page on screen, do a screen capture and post pictures of the PDF to the web so I don't lose the pretty pictures. I can even OCR the image to get the text back.
In the end, the only people limited by DRM are the honest customers. It is trivially easy to get around most DRM methods. Anyone with sufficient will to break into the PDF will do so if they can google and have half a brain.